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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72cc18de8e84fac67997af57b6bf77659fa5c05aef6e31b2e393007873a4c86c' 
  AND token = 'cjzpw9S5kU6DT03iCPxUz8XSfZybN4lEGc9ZNnqVoBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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