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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3468e12ceef7665f50a069a93fc13e4cff2f18eeb137a62f839177bfa68d6089' 
  AND token = 'fFKNzADlApkd4Fub9PfMWKAbFvVbXXWo3XLQwObwcO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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