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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '92a03592351f862ca002cc6975784ff40c01a8152a819e83cc8711b2c0267fff' 
  AND token = 'T4KgwAO5giyhAMZwbr5e8qnuu1zdVMC4QMcJTwYeS5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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