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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aa3f830699f6545db0a63946d91eb30749e0ac98c01110c448f028ecf1367ba7' 
  AND token = 'QovSqbdVPIw0S2hSRd9JxXDlPTErZtbt4LPyNAgf55s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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