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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a27340f1a94796c8a1c17fe9b22e04197d151c3c93893d5390a5791e868f7313' 
  AND token = 'fYVcd6chmeU5jdw8JqjnaDK4kf9o523RmkuULQJVWjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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