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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ef26def0b7a7402121beb13e2aa339e8397e78711d982f70744baaf3dda245ca' 
  AND token = 'EtjUn4K530UYSBLCTlug1c5bpm59/yUGn3x38ATHfXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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