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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '647a4c0055d181ba2d7af7237cf04128acc5b43d9da8f1d7a716af3a148dd6a5' 
  AND token = 'y7tUeTYdT7nd/V69E2opK8LgavMqftLCE1iC2fC9gcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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