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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f106bfca43b7fb508059764b2971098994077e2453f8bfbe703018064153e93a' 
  AND token = '7i7n7OvpljjKJx2QrxCacktQ2WCmd/1lc+LaCwTNMCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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