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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6fad92da11ef3b5eb4be0b61a76bb15efbef737b4a87f1dfb35f38eaf1b76d05' 
  AND token = 'rEXyV6/TNUZEIUecCdyjIY4rHi7EL3yFsJvpa7DT+RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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