SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '64798355236ff82b4bee2e6b84248e39f5941dc9817e6ba41945c4b610c98d83' 
  AND token = 'B0lIV+UUG53KgXtyB+OR10ARB6s5MRgzXNuOwKWgfu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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