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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cfa8ff9b6207afa58e1061b6245c8f706df93479e08876103c1d3deb34bdbc87' 
  AND token = 'yfuOL2jH9WmZdrpkpNf00Gc2OptR8OdzT4ISsBsRMfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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