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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e05fcc11dee8a62bbc7064f0d83b7ff477fac575a0baf650cd4f5ad6169774f' 
  AND token = '9F2i7UyL5lUII6zC6YVtXX2T7WIhFS0taFwQ8VdlZ1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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