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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c65ad2294d0f370bd235564e27bc36667c3f4ce2b14dab5b54b22a9b6a3f78aa' 
  AND token = 'geVBY51UG042+Fn8M2AyXjE3DA9CXVg6V4PhWq69BYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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