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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55b0e4e36fd9199f2edac15bb2515c4ae60a3a6a1e42125996d46a38a5010275' 
  AND token = 'NSFu3xfreDzUqypxzfIeP3Jzo2UpyXl7Kvye1TuyHzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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