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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bfeec4c30b2613bcfc7857eeea9e3cfbd0f74f4351dd827ab1cd830a86f1efb2' 
  AND token = 'sAOTxk6WfsmTkbsNue6NxDBGpjMZpqVsYgwKFGt7mLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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