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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '07b49a42bc5d6e019927e7dfec30fa28d0f2fa8d19c3f5e7cfa1a66b7e05bbac' 
  AND token = '4gfgjvUfQwinDgBoDwKIkWuRMVrr0yoZ+Hl05c4jwHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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