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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55c04b4dadfa8895b7376f9f837f1c121334456da08c34d2a8619008c549b01e' 
  AND token = 'aHGNxVkeg8HJ6igN9trcPt4tnELND0q/a1Osq7JeBB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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