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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c5a0eb0c0f6e9141b7d0ae34fbee94d75d58879d67491adc7a720fdfa425fe91' 
  AND token = '7Bhm/jttnOwJEaD011YahYh/43H9AryEZuK5OjCj968=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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