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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '912cbcf11206838b3a4097c1fae9086151762f7f3906860a26c12dc3ae43d674' 
  AND token = 'tBJ6mzDwhLxcTZNifiivr79fm2jMTzpt8eUj+IrexPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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