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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '14f50896311dce17a01c62dae87628f08d5feae184a9c173970581b8b1060fc8' 
  AND token = '8Z852mvVTA4ZgDtp2Kptf/TSttfO45g/LqJp6HmrUfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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