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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5cf8a361e5575881521448542b136f89e41ef3305b73c8ab3e8b984003aeb081' 
  AND token = 'uPJsfPBJb933mNmKGMh69ivqs+1d9KDr6Vzb9KCXVBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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