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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4af4b9010db129039ad36bd3b5ef2b4d634c9657866d41cff4e1b81823ee74e6' 
  AND token = 'rAbeFu+QBnIqPF/x4uS+8yWEF0ehoGVySVJTDVFNAKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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