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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ef74e4d58038962843c674630dabed9c01761ece39858783b254cf2b66a1acd' 
  AND token = '3C3QUWcRf3Suk8S1rMFkob+8ZQamGXpbfSCvYWLDeo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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