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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bb089fb29cf4fa4475b7a9fdc9d9aa237f6ff32aebd9b523f35dd3250095fc82' 
  AND token = 'Qxx6MEUAxDfKhKLFHpyXS/MgztppWX8tzPgoVFWO/KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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