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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b41cc88a2545b9ae033fdb9aa51b9e6ca450286664211ff91555c5e0624a8478' 
  AND token = 'PS0/4JVqjJ2Hd2y3kLBy0+ysNFqBoSH/9FyRcvL+fcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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