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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f1fdf44a6a770412b57b1e57c7c60c11ca7c1f31e052cba45929331e14580b3b' 
  AND token = '/eBNdFua8hKbOAjGCLtTeerUA8Dwq8vQciE0xaNGDnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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