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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '37c2310a4f5c4f7ff13afbd4daa7c7ca584e8587774e3ec6957af1196e4b17d9' 
  AND token = 'ymX5Fbn8Db8fM0OGVUZmJ/wa0HiRhia2cOdMl4JpNjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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