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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '719740a5f754e0ede51736f75a14c32ea30cbee6ae3431d626ab54957ed73ef0' 
  AND token = 'Bu2va+Zt73SziYjzduT2W60gsts92i3snq/MCu9Z1KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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