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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '184b17737e123ff1b029b65157715a140b4d135f37fd1af82868af6b1cac47c8' 
  AND token = 'nYx+wdOiIXsQ9IvasW8Ig6Sj9ml2reNu/n0wcNoSsnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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