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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84ce7663693576de0ac8199972071f33479755d64a5ec7a8701bdfe1cfc4a66c' 
  AND token = 'vPAmaRD8maRz7NJ9TDV9R1WX1ddL3K0hH+kpuYWcMRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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