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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce8bd3004a4fe20ec3179f4a9c8cababe0e1a74e3b0cf79e46be38b209ea9e9f' 
  AND token = 'ohcs9Y8Q+P4iXx+QtjrVhUXfZRN1GMEtNsiBvDmJ1QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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