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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a49b1c2ba2c2a8d15f8c67e7193cf7ee14b7733cbea886d023c962d58f1fb43' 
  AND token = 'A/sbnpqsEUWPtsZnIUulauDOeBOQAU0T77dM+6rA4k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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