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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dcb98f0afb22c299619082ed67b963d393a5cd1e227d6f9b07db1451024d44b7' 
  AND token = 'EfLDtQO5Hd7HkJQKX5OHrO3NirDB/JdE1aHFU0p0Cl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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