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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e17ad3b884ef1a4eb262968951063d532a733e5e98f1a0f4771e908e734dd0f6' 
  AND token = 'm5g5kYQl1qiSDfuMHicR26yZjRVkmL4+eKtL2cZYn7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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