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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2fdca44f7f1f061292f1b6078b5df7b986071ed20f470403d82a86cb5bd5dc39' 
  AND token = 'NFXOABA3qYZitcfA0lbqxndyQgOG3AIsuj5nL9po2a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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