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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0adef8fd72e0bcc81215df2a0bd60b2c496649a7b51068dced6cb1d4ad9d3a59' 
  AND token = 'IEXODFWmtFXz/t+SNNY5hWWR2o1Za6Dgb8GsJrsMBYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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