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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3994db18b4ebbef233e0345f8bbae022946dc1e428415d24ecec69161bb5a737' 
  AND token = 'cF127joKq2n9HP/dYh3bCsXqpF94iO2eQNwaVvUkpvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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