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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c46b43984d9dc5c70d2dd3fd68a4ac634469aab30e3ab64cfe5d2259f780ac58' 
  AND token = 'S09MQCD6Y3x8S/vvnhCVe9IXCjp26Nz3w/xrIvW3NKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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