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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9189dfea434f716bad2c988912cd00c7499a05fe458300457252cf148e4b5cb3' 
  AND token = '8vJUnNmYikpkM2XLyGvH36ckm+C6PGx9k9s0mZDjt50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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