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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2f1709803c26ef48bd6d979ef13e20fa353768ae1bbbb96a5cd0ff0a89a1d61b' 
  AND token = 'EgCi3088k3Egmlmf7ZYwzICpnTpyEnYC03Ve3/36p/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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