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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b76ab0459f06403670a1834fe465f815531056b6ac62049c9970fbf7524fbfd0' 
  AND token = '53ZKW1dHbRYK7Su14Sy0KTM7d0cFR+TDBGExzW3HGrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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