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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '29e6a10afb73dc662854ca9b84ef35ace96bc831db6a5e23db133582615e50fb' 
  AND token = '7PfSF4+Zw5XqoSR/NoxW0LSJ146bY4dgrr66KEnP5mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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