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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae603a6377a307bf5a1afb227b5264a0c832da8e830dec848d1726e7d3d5cc98' 
  AND token = 'wdylAtX0d4w2AaNcnikYSMehddpwU99vMEzB6K4RvEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}