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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e7e39311b61ac3f4b4b27b988d6d0357bcc591365279507b447502e02ff5c927' 
  AND token = 'mZdon7Es5NeVwABcl9a7FMhDin/IR32c4e1mW7Dk0aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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