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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd062d314386853f43e67322bb54b08c80198e0adc0b86aaf3ff673280a7cbc2a' 
  AND token = 'tmsQJWbtRLBpXYgXKVs2SckJiw2PZQsm7LxO+3xWMms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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