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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '59213750869bab3e8be20ff98b4ed18c3e8ca6b961c6c0ef1e38092d5dc41c02' 
  AND token = '/5apt17hhVLd8UZH4s2OQ7bK9oxPTdtUn71zq3NNWfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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