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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c779f4ed14533515b979eb958ad6cf08cb1fcd7e99e1592549cd5fab959808f6' 
  AND token = '+v2Z2QutG9ZdpHUbjlCY7eLTuAGy0AnTfFV8JOByXjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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