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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c17956bfdfe2663133545549d80d41d67a02e4d468eef4e323903403b1ba7612' 
  AND token = '6UTMx7aQ9DO4MX2FMjG2xDn7L+TDrokMIx4dSEsnFVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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