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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '71988530479b0242719ffe5f1aa497dcf5d285a74b9cc279583d2ff132661a26' 
  AND token = 'TyeYaRyDWX3jQgS71QXkB8XoycUpe4nR5cM7oA9wEDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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