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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cf74a298ad7eb6e495bd0570d23c357f7948327eceea496634c5d3f0558a47fb' 
  AND token = 'E8btyW6iASuaduaMcCCqg4Yj9GBSzHAx4j6375EU5sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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