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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '64a19387879c923600dd8818ef99c69e9ca7992c458419ac0d370379ff640cc5' 
  AND token = 'EpMHGKZclRsGVG7gXM9NjR6zQ/e/PQP2mCyT7sQqO1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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