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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b1ac0a20b7271a849283d814d2de5d5b7dc2c8f2e3f0e098820a47fe1106fc26' 
  AND token = 'M5UTSzoOFAEzt0rKi0WBScjfHFKUX7vWqEZERM6irvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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