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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6a1dfab7f41ba60f11cc90e08a146427f548659c217b93af3536d14d05ddf8f1' 
  AND token = '1tC1bdIWJkIH7tmGRer5qRfddwdOr1ZSS9iGOX51cAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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