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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e4851c715f13be8db127539ae4f58066f6161614d255e8a46d1abef0f7f98653' 
  AND token = 'lUK9iFMABT3AJUpUkBNF+hn70vhf9ojMWRUx9n+Jybc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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