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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6a075d62c292fe1a18bf2cc9649d3c8427220a388706fc2ac822be949a56d3d8' 
  AND token = '7CdlDAk+MDhTr6gEK7brLtr6q1IhXSH5cSj4a1h+Fkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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