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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0822358d053249ab746c39f4c0ed4e90277edbcffd1c8ef29e096c427c14db79' 
  AND token = '2lXna+x4v2N/9Soh7QXXh8nmfmjTEzT/wiI0eelyM4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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