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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a32b66d46e01cc719c79d82dba200af27beed9d8613ec4b466709244d296e2b8' 
  AND token = 'AZghmLVWrEX3Qt4kVyL6hg13r9YGVMWdBX2c08QFvuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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