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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '85fbe0cfaebcffcfa5c578c04c4bb7d778d3450ef500386f57ec8cc0da856e30' 
  AND token = 'h3+jIFWNUPoAc2umH4Exc8AYYtoJW7D01YD2tXajePw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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