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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f407baac08c9b92917521be11fbd646988e9a919872148c9eee6775fec3eaad2' 
  AND token = 'mgwHxJ9t0FJg7Ire0oOHXZpee3B+dzskZ2FfNrzPDdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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