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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31e7ff92865ee09f06b270acf82bd2b9145cbaf164748ea3ac808ca89add6ef2' 
  AND token = 'Zomv+E6dG1pa2zXUVMMO3OSsWo/JuqixVVQ8Q6GXEa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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